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| 1 | +/************************************************************************* |
| 2 | + > Filename : 002-josephdrlink.c |
| 3 | + > Author : oneface - one_face@sina.com |
| 4 | + > Company : Monte Cristo |
| 5 | + > Time : 2018-02-09 14:15:04 |
| 6 | + ************************************************************************/ |
| 7 | + |
| 8 | +#include<stdio.h> |
| 9 | +#include <stdlib.h> |
| 10 | + |
| 11 | +/* |
| 12 | + 不要有头节点，仅仅使用首元节点，方便问题的解决 |
| 13 | + */ |
| 14 | + |
| 15 | +typedef struct _josephdrlink { |
| 16 | + char data; |
| 17 | + struct _josephdrlink *prev; |
| 18 | + struct _josephdrlink *next; |
| 19 | +}josephdrlink; |
| 20 | + |
| 21 | +static void josephdrlink_init(josephdrlink **jspdr, int people) |
| 22 | +{ |
| 23 | + int i = 0; |
| 24 | + josephdrlink *jspdrp = *jspdr, *njspdr; |
| 25 | + |
| 26 | + if (jspdrp != NULL) { |
| 27 | + printf("josephdrlink is already exsit\n"); |
| 28 | + return ; |
| 29 | + } |
| 30 | + |
| 31 | + while (i < people) { |
| 32 | + njspdr = (josephdrlink *)malloc(sizeof(josephdrlink)); |
| 33 | + if (!njspdr) { |
| 34 | + printf("njspdr malloc failed\n"); |
| 35 | + return ; |
| 36 | + } |
| 37 | + njspdr->data = 'a' + i++; |
| 38 | + |
| 39 | + if (!jspdrp) { |
| 40 | + jspdrp = njspdr; |
| 41 | + jspdrp->next = jspdrp; |
| 42 | + jspdrp->prev = jspdrp; |
| 43 | + *jspdr = jspdrp; |
| 44 | + } else { |
| 45 | + njspdr->next = jspdrp->next; |
| 46 | + jspdrp->next->prev = njspdr; |
| 47 | + jspdrp->next = njspdr; |
| 48 | + njspdr->prev = jspdrp; |
| 49 | + } |
| 50 | + jspdrp = jspdrp->next; |
| 51 | + } |
| 52 | +} |
| 53 | + |
| 54 | +static void josephdrlink_show(josephdrlink *jspdr) |
| 55 | +{ |
| 56 | + josephdrlink *jspdrp = jspdr; |
| 57 | + if (!jspdrp) { |
| 58 | + printf("josephdrlink is not exsit\n"); |
| 59 | + return ; |
| 60 | + } |
| 61 | + |
| 62 | + do { |
| 63 | + printf("%c->", jspdrp->data); |
| 64 | + jspdrp = jspdrp->next; |
| 65 | + } while(jspdrp != jspdr); |
| 66 | + |
| 67 | + printf("\n"); |
| 68 | +} |
| 69 | + |
| 70 | +int main(int argc, char **argv) |
| 71 | +{ |
| 72 | + int people, hit; |
| 73 | + josephdrlink *jspdr = NULL; |
| 74 | + |
| 75 | + if (argc < 3) { |
| 76 | + fprintf(stderr, "please read usage: ./a.out 24 3\n"); |
| 77 | + return ; |
| 78 | + } |
| 79 | + |
| 80 | + people = atoi(argv[1]); |
| 81 | + hit = atoi(argv[2]); |
| 82 | + printf("p %d h %d\n", people, hit); |
| 83 | + |
| 84 | + josephdrlink_init(&jspdr, people); |
| 85 | + josephdrlink_show(jspdr); |
| 86 | + |
| 87 | + return 0; |
| 88 | +} |
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